面板堆石坝深覆盖层地基防渗技术研究与运用

Study and application of anti-seepage technique in deep overburden foundation of CFRD

以云南省某水电站混凝土面板堆石坝为例,对在深厚覆盖层地区筑坝建库的防渗问题进行了研究。经多方案比选,最终选定的防渗方案为:由趾板在上游方向经连接板与防渗墙连接、下游与面板相接;接缝设置为柔性变形缝,缝的底、中、顶部分别设铜止水片、PVC止水和柔性止水,缝内填12 mm厚沥青木板,顶部覆盖粉煤灰和粘土料,连接板和趾板下铺一层土工织物,再铺50 cm厚的2B料作为反滤。工程竣工后的观测资料显示,坝体各部位运行正常。其创新的防渗体系可为同类工程参考。

A CFRD in Yunnan Province is taken as an example,and its anti-seepage in the deep overburden foundation is studied.After comparison,the anti-seepage scheme is determined,namely,the toe slab is linked with cut-off wall at upstream and with face slab at downstream by linking slab;for the flexible deformation joint,copper water-stop,PVC water-stop and flexible water-stop are arranged in its bottom,middle and top parts correspondingly;a width of 12 mm wood board is filled in the joint,and its top are covered with fly ash and clay material;a layer of geo-textile and a 50 cm-thick of 2B material are paved under the linking slab and toe slab.According to the measuring data after completion,the working performance of CFRD is in a normal state.